5.1.1.6. Mechanical APDL References and Notes

The following Mechanical APDL commands, element types, and considerations are applicable:

The Nonlinear Adaptive Region is applied with the NLADAPTIVE command.
When the Scoping property is defined as Geometry, the Nonlinear Adaptive Region condition uses the CM command to create the Nonlinear Adaptive Region component.
When the Scoping property is defined as a Named Selection, the Nonlinear Adaptive Region condition uses the CMBLOCK command to create the Nonlinear Adaptive Region component.
The CMSEL,ALL command and the ESEL,ALL command are issued at beginning of the NLADAPTIVE command.
During a Structural Analysis, the Nonlinear Adaptive Region is applied using one of the following element types:
- PLANE182 (2-D Low Order)
- PLANE183 (2-D High Order)
- SOLID185 (3D Linear Hex-Dominant)
- SOLID186 (3D Quadratic Hex-Dominant)
- SOLID187 (3-D Quadratic Tetrahedral)
- SOLID285 (3-D Linear Tetrahedral)
When a Nonlinear Adaptive Region is scoped to a body/element, the associated part is meshed with SOLID285 element type if they are linear tetrahedral or SOLID187 element type if they are quadratic tetrahedral.
When a Nonlinear Adaptive Region is deactivated for certain steps, the NLADAPTIVE command is set to be OFF in the corresponding load steps. Relatively, an activated Nonlinear Adaptive Region sets the NLADAPTIVE command to be ON.
When a Nonlinear Adaptive Region is applied, the ETCONTROL ,SET command is not issued.

For additional guidance about how to best use this feature, see the Mesh Nonlinear Adaptivity Hints and Recommendations section in the Mechanical APDL Advanced Analysis Guide.